See https://support.zoom.us/hc/en-us/articles/202050538-Audio-Echo-In-A-Meeting
In brief, don't have more than one active microphone in a room.
How do I avoid audio echo in a Zoom meeting?
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See https://support.zoom.us/hc/en-us/articles/202050538-Audio-Echo-In-A-Meeting
In brief, don't have more than one active microphone in a room.